package org.mat.admin.sys.service.impl;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.HashMap;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.imageio.ImageIO;

import org.mat.admin.sys.RedisService;
import org.mat.admin.sys.config.properties.CaptchaProperties;
import org.mat.admin.sys.service.ValidateCodeService;
import org.mat.admin.sys.util.CacheConstants;
import org.mat.admin.sys.util.Constants;
import org.mat.admin.sys.util.IdUtils;
import org.mat.admin.sys.util.StringUtils;
import org.mat.framework.lang.constant.DefaultErrors;
import org.mat.framework.lang.dto.MatApiResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.FastByteArrayOutputStream;
import com.google.code.kaptcha.Producer;


/**
 * 验证码实现处理
 *
 * @author ruoyi
 */
@Service
public class ValidateCodeServiceImpl implements ValidateCodeService {
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private RedisService redisService;

    @Autowired
    private CaptchaProperties captchaProperties;

    /**
     * 生成验证码
     */
    @Override
    public MatApiResponse createCaptcha() throws IOException {
        MatApiResponse matApiResponse = MatApiResponse.success(null);
        boolean captchaEnabled = captchaProperties.getEnabled();

        //TODO 封装响应信息
        //        matApiResponse.put("captchaEnabled", captchaEnabled);
        if (!captchaEnabled) {
            return matApiResponse;
        }

        // 保存验证码信息
        String uuid = IdUtils.simpleUUID();
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;

        String capStr = null, code = null;
        BufferedImage image = null;

        String captchaType = captchaProperties.getType();
        // 生成验证码
        if ("math".equals(captchaType)) {
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        } else if ("char".equals(captchaType)) {
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }

        redisService.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try {
            ImageIO.write(image, "jpg", os);
        } catch (IOException e) {
            return MatApiResponse.fail(DefaultErrors.DEFAULT.getCode(), e.getMessage());
        }
//TODO 封装响应信息
//        matApiResponse.put("uuid", uuid);
//        matApiResponse.put("img", Base64.encode(os.toByteArray()));

        HashMap<String, String> codeMap = new HashMap<>();
        codeMap.put("uuid", uuid);
        codeMap.put("img", Base64.encode(os.toByteArray()));
        matApiResponse.setData(codeMap);
        return matApiResponse;
    }

    /**
     * 校验验证码
     */
    @Override
    public void checkCaptcha(String code, String uuid) {
        if (StringUtils.isEmpty(code)) {
            throw new RuntimeException("验证码不能为空");
        }
        if (StringUtils.isEmpty(uuid)) {
            throw new RuntimeException("验证码已失效");
        }
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;
        String captcha = redisService.getCacheObject(verifyKey);
        redisService.deleteObject(verifyKey);

        if (!code.equalsIgnoreCase(captcha)) {
            throw new RuntimeException("验证码错误");
        }
    }
}
